Double-layer spraying system of cleaning machine and cleaning machine

Abstract

The utility model relates to a double-layer spraying system of a cleaning machine and the cleaning machine. The double-layer spraying system comprises a lower bowl basket, a lower spraying arm, an upper bowl basket and an upper spraying arm, wherein the lower bowl basket is placed in a washing cavity of the cleaning machine; the lower spraying arm is arranged in the washing cavity and located below the lower bowl basket and sprays tableware in the lower bowl basket. The upper bowl basket is placed at the upper part of the washing cavity; the upper spraying arm is arranged in the washing cavity and located at the bottom of the upper bowl basket and sprays tableware in the upper bowl basket. After the upper bowl basket and the upper spraying arm are placed in the washing cavity, the control structure can conduct the water distribution pipeline to supply water to the upper spraying arm, and after the upper bowl basket and the upper spraying arm are taken out of the washing cavity, the control structure cuts off the water distribution pipeline to prevent water flow from ascending, so that the water flow sprays the lower bowl basket only through the lower spraying arm; the upper bowl basket can be directly arranged in the lower bowl basket in a sleeved mode and restrained on the upper portion of the lower bowl basket, a user can directly place the upper bowl basket from top to bottom when needing to use the upper spraying structure, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, in particular to a double-layer spray system and a washing machine for washing tableware, fruits and vegetables. Background Art

[0002] Current sink-type dishwashers mostly use a single-layer spray system. During operation, dishes are placed above the spray arm, which sprays water from the bottom up to rinse the dishes. Because the cleaning water only has impact in a limited direction, the dishwashing basket and dishes need to be placed near the bottom of the washing chamber. This inevitably leads to insufficient cleanliness when a large number of dishes are being washed.

[0003] To address the above-mentioned issues, the applicant's prior patent application ZL 202010288585.7, "A Double-Layer Spray System and a Cleaning Machine Incorporating the System," discloses a structure comprising a double-layer spray system comprising a first spray arm, an impeller assembly, and a second spray arm. The second spray arm is fluidically connected to the water collection chamber of the first spray arm via a water supply channel. The top wall of the first spray arm is provided with a water outlet for supplying water into the water supply channel. The top of the first spray arm is provided with a first spatial guide impeller capable of pressurizing the water entering the water supply channel. The first spatial guide impeller is connected to the top of the impeller assembly and rotates synchronously therewith. During use, the impeller assembly draws water from the water collection chamber of the first spray arm. The water flows through the upper portion of the impeller assembly and is then sprayed out for lower-layer spraying. Simultaneously, the water in the water collection chamber also enters the second spray arm above it through the output channel for upper-layer spraying, thereby achieving double-layer spraying.

[0004] Although the above solution can increase the number and cleanliness of dishes washed by double-layer spraying, since the upper and lower spray arms can only operate at the same time, there is a problem of water waste when there are fewer dishes to be washed. Utility Model Content

[0005] The first technical problem to be solved by the present invention is to provide a double-layer spray system for a washing machine that can select a spray mode according to the number of dishes to be washed, thereby improving the cleanliness while saving water, in response to the current status of the existing technology.

[0006] The second technical problem to be solved by the present invention is to provide a cleaning machine with the above-mentioned double-layer spray system in view of the current status of the existing technology.

[0007] The technical solution adopted by the present invention to solve at least one of the above technical problems is:

[0008] A double-layer spray system for a cleaning machine, comprising:

[0009] The lower bowl basket is placed in the washing chamber of the washing machine;

[0010] a lower spray arm, disposed in the washing chamber and below the lower bowl basket, for spraying the tableware in the lower bowl basket;

[0011] An upper bowl basket is placed on the upper part of the washing chamber;

[0012] an upper spray arm, disposed in the washing chamber and at the bottom of the upper basket, for spraying the tableware in the upper basket;

[0013] The top edge of the lower basket extends upward to a position close to the top opening of the washing chamber, and the upper basket is nested in and constrained by the upper portion of the lower basket. A water diversion port is formed in the top wall of the lower spray arm, and the upper spray arm is connected to the water diversion port via a water diversion pipe. The water diversion pipe is provided with a control structure that can connect the water diversion pipe when the upper basket is placed in the washing chamber and isolate the water diversion pipe when the upper basket is removed from the washing chamber.

[0014] Preferably, the top edge of the lower basket is provided with circumferentially arranged support ribs. Correspondingly, the top edge of the upper basket is provided with outwardly extending support ribs that rest on the support ribs when the upper basket is inserted into the lower basket. With this structure, when using the upper basket and upper spray arm, simply place the upper basket into the wash chamber through the top opening, making operation convenient.

[0015] Preferably, the lower basket's support ribs are equipped with an upward-extending, inverted U-shaped first handle. The ribs at the top edge of the upper basket are recessed inward to form a U-shaped second handle, opening toward the inner wall of the washing chamber. This structure facilitates independent placement and removal of the lower and upper baskets containing tableware into and out of the washing chamber.

[0016] In the present invention, the bottom wall of the lower spray arm is provided with a first inlet for water flow to enter. Accordingly, the top wall of the lower spray arm is provided with a water diversion port for upwardly conveying a portion of the water flow. The water diversion port is connected to the water diversion pipe. The water diversion pipe is provided with a valve stem that can move up and down to open or close the lower end of the water diversion pipe. The valve stem always tends to move upward to close the lower end of the water diversion pipe. The upper spray arm is provided with a water guide member that can be inserted from top to bottom into the water diversion pipe, thereby driving the valve stem to move downward, thereby opening the lower end of the water diversion pipe and connecting it to the upper spray arm. The water guide member and the valve stem together constitute the control structure. This structure facilitates the connection and disconnection of the water diversion pipe as the upper basket and the upper spray arm below the upper basket are placed in or out of the washing chamber. The connection and disconnection point is located on the top wall of the lower spray arm, preventing water from filling the water diversion pipe when the diversion pipe is blocked, thereby affecting the water flow pattern and improving the lower spray effect.

[0017] Preferably, the water guide is rotatably connected to the upper spray arm, with its upper end passing through the upper spray arm and constrained to the bottom of the upper basket. Using a single water guide to achieve the connection between the upper spray arm and the upper basket, the relative rotation of the upper spray arm, and the communication between the upper spray arm and the water distribution pipe greatly simplifies the connection structure and facilitates production and assembly.

[0018] Preferably, the water guide comprises a first portion, a second portion, and a third portion, which are connected in sequence from top to bottom and have gradually decreasing diameters. The bottom wall of the upper spray arm is provided with a second inlet for water flow to enter. Correspondingly, the top wall of the upper spray arm is provided with a mounting opening corresponding to the second inlet. The water guide is arranged through the mounting opening and the second inlet. The first portion is located above the top wall of the upper spray arm and connected to the bottom of the upper basket. The second portion is located within the upper spray arm and has a water outlet on its side wall. The third portion is located below the bottom wall of the upper spray arm and connected to the upper end of the water distribution pipe. The above structure ensures a compact and reliable connection between the water guide, the upper basket, the upper spray arm, and the water distribution pipe.

[0019] Preferably, the upper end of the first part of the water guide is a blind end and is formed with a horizontally arranged supporting plate, and the supporting plate is provided with a clamping hole that can clamp the bottom rib of the upper bowl basket therein.

[0020] Preferably, the top wall of the upper spray arm is provided with a first bead extending upward from the edge of the mounting opening. A first stepped surface is formed between the first and second portions, capable of abutting and rotating with the first bead. The inner bottom wall of the upper spray arm is provided with a second bead extending upward from the edge of the second inlet. A second stepped surface is formed between the second and third portions, capable of abutting and rotating with the second bead. This structure not only provides axial positioning of the water guide but also reduces the rotational engagement area, thereby reducing friction and improving the smoothness and stability of the upper spray arm's rotation.

[0021] Preferably, the outer peripheral wall of the second portion is provided with a clamping foot that can cooperate with the inner top wall of the upper spray arm to axially limit the water guide member.

[0022] Preferably, a pressing rib is provided in the lower port of the third part, which can press against the upper end of the valve stem when the third part is inserted into the water distribution pipe.

[0023] Preferably, the top wall of the lower spray arm extends upward along the edge of the water diversion port to form a water diversion area with an inverted U-shaped cross-section. The lower end of the water diversion pipe is connected to the top of the water diversion area. The lower end of the valve stem is formed to be able to move up and down to constrain a water sealing member in the water diversion area. The water sealing member moves upward with the valve stem to close the lower end of the water diversion pipe, and moves downward to open the lower end of the water diversion pipe. The lower spray arm is provided with an elastic member that is elastically compressed under the water sealing member and maintains the upward movement of the water sealing member. The above structure facilitates the connection of the water diversion pipe as the upper bowl basket and the upper spray arm below the upper bowl basket are placed in or removed from the washing chamber.

[0024] A washing machine includes a water tank with a concave return water area at the bottom, and also includes the above-mentioned double-layer spray system, wherein the bottom of the lower bowl basket is supported on the bottom of the washing chamber, the upper bowl basket is located at the upper part of the washing chamber, and the lower spray arm is connected to the return water area through a water pump mechanism.

[0025] Compared with the prior art, the advantages of the present invention are: after the upper bowl basket and the upper spray arm of the present invention are placed in the washing chamber, the control structure can connect the water distribution pipe to supply water to the upper spray arm; after the upper bowl basket and the upper spray arm are taken out of the washing chamber, the control structure will isolate the water distribution pipe to prevent the water from flowing upward, so that the water flows only through the lower spray arm to spray the lower bowl basket, so that the spray mode can be selected according to the number of dishes to be washed, while improving the cleanliness and saving water; the upper bowl basket can be directly placed in the lower bowl basket and constrained on the upper part of the lower bowl basket. When the user needs to use the upper spray structure, he can directly lower the upper bowl basket from top to bottom, which is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the cleaning machine according to an embodiment of the present utility model (double-layer spraying state);

[0027] Figure 2 This is a structural diagram of the cleaning machine according to an embodiment of the present utility model (single-layer spraying state);

[0028] Figure 3 This is an exploded view of the double-layer spray system in the embodiment of the present utility model;

[0029] Figure 4 This is a diagram showing the coordination between the valve stem and the water distribution pipe in the double-layer spray state according to an embodiment of the utility model;

[0030] Figure 5 This is an assembly diagram of the water guide, upper bowl basket, upper spray arm and water distribution pipe in the embodiment of the utility model;

[0031] Figure 6 This is a diagram showing the coordination between the valve stem and the water distribution pipe in a single-layer spray state according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0033] like Figures 1 to 6 As shown, the double-layer spray system of the washing machine of this embodiment includes a lower basket 10, a lower spray arm 100, an upper basket 20, and an upper spray arm 200. The lower basket 10 is placed in the washing chamber 11 of the washing machine; the lower spray arm 100 is arranged in the washing chamber 11 and below the lower basket 10, and is used to spray the tableware in the lower basket 10; the upper basket 20 is placed in the upper part of the washing chamber 11; the upper spray arm 200 is arranged in the washing chamber 11 and at the bottom of the upper basket 20, and is used to spray the tableware in the upper basket 20.

[0034] Specifically, the top edge of the lower basket 10 extends upward to near the top opening of the washing chamber 11, and the upper basket 20 is nested and restrained within the upper portion of the lower basket 10. The top edge of the lower basket 10 is provided with circumferentially arranged support ribs 001. Correspondingly, the top edge of the upper basket 20 is provided with outwardly extending support ribs 002 that rest on the support ribs 001 when the upper basket 20 is inserted into the lower basket 10. With this structure, when using the upper basket 20 and upper spray arm 200, simply place the upper basket 20 into the washing chamber 11 through the top opening, making operation convenient.

[0035] The support ribs 001 of the lower basket 10 are equipped with an upward-extending first handle 003 in an inverted U-shape. The ribs at the top edge of the upper basket 20 are recessed inward to form a second U-shaped handle 004, which opens toward the inner wall of the washing chamber 11. This structure facilitates independent placement and removal of the lower and upper baskets 10, 20 containing tableware into and out of the washing chamber 11.

[0036] In this embodiment, a water diversion port 102 is formed on the top wall of the lower spray arm 100, and the upper spray arm 200 is connected to the water diversion port 102 via a water diversion pipe 300. The water diversion pipe 300 is provided with a control structure that can open the water diversion pipe 300 when the upper bowl basket 20 is placed in the washing chamber 11 and isolate the water diversion pipe 300 when the upper bowl basket 20 is removed from the washing chamber 11.

[0037] Specifically, the bottom wall of the lower spray arm 100 is provided with a first inlet 101 for water flow to enter, and accordingly, a water diversion port 102 is opened on the top wall of the lower spray arm 100 for transporting part of the water flow upward, and the water diversion port 102 is connected to the water diversion pipe 300, and the water diversion pipe 300 is provided with a valve stem 71 that can move up and down to open or close the lower end of the water diversion pipe 300. The valve stem 71 always maintains a tendency to move upward and close the lower end of the water diversion pipe 300. The upper spray arm 200 is provided with a water guide member 72 that can be inserted into the water diversion pipe 300 from top to bottom, thereby driving the valve stem 71 to move downward and then open the lower end of the water diversion pipe 300 and connect it with the upper spray arm 200. The water guide member 72 and the valve stem 71 together constitute a control structure. The above structure facilitates the connection or disconnection of the water distribution pipe 300 as the upper bowl basket 20 and the upper spray arm 200 below the upper bowl basket 20 are placed in or out of the washing chamber 11, and the connection or disconnection point is located on the top wall of the lower spray arm 100, avoiding the water flow filling the water distribution pipe 300 when the water distribution pipe 300 is disconnected and affecting the water flow state, thereby improving the lower spraying effect.

[0038] The top wall of the lower spray arm 100 extends upward along the edge of the water diversion opening 102 to form a water diversion area 103 with an inverted U-shaped cross-section. The lower end of the water diversion pipe 300 extends through the top of this water diversion area 103. The lower end of the valve stem 71 is formed into a water sealing member 711 that can be moved up and down within this water diversion area 103. This water sealing member 711 moves upward with the valve stem 71 to close the lower end of the water diversion pipe 300, and moves downward to open the lower end of the water diversion pipe 300. This structure facilitates the connection of the water diversion pipe 300 as the upper basket 20 and the upper spray arm 200 below it are placed in or removed from the washing chamber 11.

[0039] The lower spray arm 100 is equipped with an elastic member 73 that is elastically compressed beneath the water seal 711, maintaining its upward movement. A water guide sleeve 104 extends upward from the first inlet 101. The diameter of this water guide sleeve 104 is smaller than the inner diameter of the first inlet 101, and its bottom is restrained against the inner wall of the first inlet 101 by a connecting arm 105. The elastic member 43 is a spring, the lower portion of which is sheathed around the outer periphery of the water guide sleeve 104, with its lower end abutting against the connecting arm 105 and its upper end abutting against the water seal 711. This structure facilitates the installation of the elastic member 73.

[0040] The cross-section of the water sealing member 711 is an inverted U-shaped structure. The lower end of the water sealing member 711 is always nestled around the outer periphery of the upper portion of the water guide sleeve 104 with a gap between them. The upper end of the elastic member 73 is hidden beneath the water sealing member 711 and abuts against the inner top wall of the water sealing member 711. This structure helps improve the elastic stability of the elastic member 73, thereby enhancing the reliability of the vertical movement of the valve stem 71.

[0041] The upper portion of the valve stem 71 forms a guide rod 712 extending upward from the top wall of the water-sealing element 711 along the central axis of the water distribution pipe 300. The guide rod 712 has a cross-shaped cross-section when viewed from above. Water flowing upward through the water distribution pipe 300 can form vortices along the pipe wall, causing energy loss. The guide rod 712 guides the water upward along the axial direction of the water distribution pipe 300 and disrupts any vortices that may form in the radial direction, thereby reducing energy loss.

[0042] The water guide 72 of this embodiment is rotatably connected to the upper spray arm 200, with its upper end extending through the upper spray arm 200 and constrained to the bottom of the upper basket 20. Using a single water guide 72 to achieve the connection between the upper spray arm 200 and the upper basket 20, the relative rotation of the upper spray arm 200, and the communication between the upper spray arm 200 and the water distribution pipe 300 greatly simplifies the connection structure and facilitates production and assembly.

[0043] The water guide 72 comprises a first portion 721, a second portion 722, and a third portion 723, which connect in sequence from top to bottom and have gradually decreasing diameters. The bottom wall of the upper spray arm 200 defines a second inlet 210 for water entry. Correspondingly, the top wall of the upper spray arm 200 defines a mounting opening 005 corresponding to the second inlet 210. The water guide 72 passes through the mounting opening 005 and the second inlet 210. The first portion 721 is located on the top wall of the upper spray arm 200 and connects to the bottom of the upper basket 20. The second portion 722 is located within the upper spray arm 200 and has at least two inverted U-shaped water outlets 7221 defined in its sidewall. The third portion 723 is located below the bottom wall of the upper spray arm 200 and connects to the upper end of the water distribution pipe 300. This structure ensures a compact and reliable connection between the water guide 72, the upper basket 20, the upper spray arm 200, and the water distribution pipe 300.

[0044] The upper end of the first portion 721 of the water guide 72 is a blind end and is formed with a horizontally arranged supporting plate 7211. The supporting plate 7211 is provided with a clamping hole 7212 that can clamp the bottom rib of the upper bowl basket 20 therein.

[0045] The top wall of the upper spray arm 200 is equipped with a first bead 01 extending upward from the edge of the mounting opening 005. A first stepped surface 011 is formed between the first portion 721 and the second portion 722, capable of abutting and rotating with the first bead 01. The inner bottom wall of the upper spray arm 200 is equipped with a second bead 02 extending upward from the edge of the second inlet 210. A second stepped surface 021 is formed between the second portion 722 and the third portion 723, capable of abutting and rotating with the second bead 02. The outer peripheral wall of the second portion 722 is provided with a latching foot 7222 that engages with the inner top wall of the upper spray arm 200 to axially limit the water guide 72. This structure not only effectively limits the axial position of the water guide 72, but also reduces the rotational engagement area, thereby reducing friction and improving the smoothness and stability of the upper spray arm 200's rotation.

[0046] The lower end of the third portion 723 is provided with a pressing rib 7231 that presses against the upper end of the valve stem 71 when the third portion 723 is inserted into the water distribution pipe 300. When the third portion 723 is mated with the upper end of the water distribution pipe 300, a sealing ring 7232 is provided on the outer circumference of the third portion 723 to seal against the inner circumference of the water distribution pipe 300.

[0047] The washing machine of this embodiment includes a water tank 1, the bottom of which is provided with a concave return water area 12, and also includes the above-mentioned double-layer spray system. The bottom of the lower bowl basket 10 is supported on the bottom of the washing chamber 11, the upper bowl basket 20 is located at the upper part of the washing chamber 11, and the lower spray arm 100 is connected to the return water area 12 through the water pump mechanism 3.

[0048] When washing a small amount of dishes, the upper basket 20 is removed from the washing chamber 11, and the upper spray arm 200 is taken out with it. The dishes are then placed in the lower basket 10. The control mechanism blocks the water distribution pipe 300, preventing water from flowing upward. The open water pump 3 operates, drawing water from the return water area 12 into the lower spray arm 100, spraying and washing the dishes in the lower basket 10.

[0049] When washing a large amount of tableware, the upper basket 20 is placed in the washing chamber 11. The upper spray arm 200 at the bottom of the upper basket 20 is connected to the upper end of the water distribution pipe 300. The control structure connects the water distribution pipe 300, and the open water pump 3 is operated to draw water from the return water area 12 into the lower spray arm 100. Part of the water flows through the lower spray arm 100 to spray and wash the tableware in the lower basket 10, and part of the water flows through the water distribution pipe 300 to be sent to the upper spray arm 200 to spray and wash the tableware in the upper basket 20.

[0050] In this embodiment, after the upper basket 20 and upper spray arm 200 are placed in the washing chamber 11, the control structure can connect the water distribution pipe 300 to supply water to the upper spray arm 200. After the upper basket 20 and upper spray arm 200 are removed from the washing chamber 11, the control structure isolates the water distribution pipe 300 to prevent water from flowing upward, so that water flows only through the lower spray arm 100 to spray the lower basket 10. Therefore, the spray mode can be selected according to the number of dishes to be washed, improving the cleanliness while saving water. The upper basket 20 can be directly inserted into the lower basket 10 and restrained at the upper portion of the lower basket 10. When the user needs to use the upper spray mechanism, he can simply lower the upper basket 20 from the top to the bottom, which is convenient to operate.

[0051] In the specification and claims of the present invention, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used to describe various exemplary structural parts and components of the present invention. However, these terms are used herein for convenience of description only and are based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A double-layer spray system for a cleaning machine, comprising: A lower bowl basket (10) is placed in a washing chamber (11) of a washing machine; A lower spray arm (100) is arranged in the washing chamber (11) and below the lower bowl basket (10), and is used to spray the tableware in the lower bowl basket (10); An upper bowl basket (20) is placed on the upper part of the washing chamber (11); An upper spray arm (200) is arranged in the washing chamber (11) and located at the bottom of the upper bowl basket (20), and is used to spray the tableware in the upper bowl basket (20); The invention is characterized in that: the top edge of the lower basket (10) extends upward to the top opening close to the washing chamber (11); the upper basket (20) is sleeved and restrained in the upper part of the lower basket (10); the top wall of the lower spray arm (100) is provided with a water diversion port (102); the upper spray arm (200) is connected to the water diversion port (102) through a water diversion pipe (300); and a control structure is provided in the water diversion pipe (300) which can conduct the water diversion pipe (300) when the upper basket (20) is placed in the washing chamber (11) and cut off the water diversion pipe (300) when the upper basket (20) is taken out of the washing chamber (11).

2. The double-layer spray system of the cleaning machine according to claim 1, characterized in that: The top edge of the lower basket (10) is provided with supporting ribs (001) arranged in a circumferential direction, and correspondingly, the top edge of the upper basket (20) is provided with a supporting edge (002) extending outward and capable of being placed on the supporting ribs (001) when the upper basket (20) is inserted into the lower basket (10).

3. The double-layer spray system of the cleaning machine according to claim 2, characterized in that: The supporting ribs (001) of the lower basket (10) are provided with a first handle (003) extending upward and having an inverted U-shaped structure, and the ribs at the top edge of the upper basket (20) are recessed inward to form a U-shaped second handle (004) arranged with its opening facing the inner wall of the washing chamber (11).

4. The double-layer spray system of a cleaning machine according to claim 1, 2 or 3, characterized in that: The bottom wall of the lower spray arm (100) is provided with a first inlet (101) for water flow to enter, and correspondingly, the top wall of the lower spray arm (100) is provided with a water outlet (102) for part of the water flow to be transported upward, and the water outlet (102) is connected to the water outlet pipe (300), and the water outlet pipe (300) is provided with a valve stem (71) that can move up and down to open or close the lower end of the water outlet pipe (300), and the valve stem (71) always maintains a tendency to move upward to close the lower end of the water outlet pipe (300), and the upper spray arm (200) is provided with a water guide member (72) that can be inserted into the water outlet pipe (300) from top to bottom, thereby driving the valve stem (71) to move downward and thereby open the lower end of the water outlet pipe (300) and connect it with the upper spray arm (200), and the water guide member (72) and the valve stem (71) together constitute the control structure.

5. The double-layer spray system of the cleaning machine according to claim 4, characterized in that: The water guide (72) is rotatably connected to the upper spray arm (200), and the upper end passes through the upper spray arm (200) and is constrained together with the bottom of the upper bowl basket (20).

6. The double-layer spray system of the cleaning machine according to claim 5, characterized in that: The water guide member (72) comprises a first part (721), a second part (722), and a third part (723) which are connected in sequence from top to bottom and whose diameters gradually decrease. The bottom wall of the upper spray arm (200) is provided with a second inlet (210) for water flow to enter. Correspondingly, the top wall of the upper spray arm (200) is provided with a mounting opening (005) arranged corresponding to the second inlet (210). The water guide member (72) is arranged through the mounting opening (005) and the second inlet (210). The first part (721) is located on the top wall of the upper spray arm (200) and is connected to the bottom of the upper bowl basket (20). The second part (722) is located in the upper spray arm (200) and has a water outlet (7221) on its side wall. The third part (723) is located below the bottom wall of the upper spray arm (200) and is connected to the upper end of the water distribution pipe (300).

7. The double-layer spray system of a cleaning machine according to claim 6, characterized in that: The upper end of the first part (721) of the water guide (72) is a blind end and is formed with a horizontally arranged support plate (7211), and the support plate (7211) is provided with a clamping hole (7212) capable of clamping the bottom rib of the upper bowl basket (20) therein.

8. The double-layer spray system of a cleaning machine according to claim 6, characterized in that: The top wall of the upper spray arm (200) is provided with a first convex ring (01) extending upward from the edge of the mounting opening (005), and a first step surface (011) is formed between the first part (721) and the second part (722) and can abut against the first convex ring (01) and rotatably cooperate with the first convex ring (01).

9. The double-layer spray system of a cleaning machine according to claim 6, characterized in that: The inner bottom wall of the upper spray arm (200) is provided with a second convex ring (02) extending upward from the edge of the second inlet (210), and a second step surface (021) is formed between the second part (722) and the third part (723) and can abut against the second convex ring (02) and rotatably cooperate with the second convex ring (02).

10. The double-layer spray system of a cleaning machine according to claim 9, characterized in that: The outer peripheral wall of the second part (722) is provided with a clamping foot (7222) that can cooperate with the inner top wall of the upper spray arm (200) to axially limit the water guide member (72).

11. The double-layer spray system of a cleaning machine according to claim 6, characterized in that: A pressing rib (7231) is provided in the lower end of the third part (723) and is capable of pressing against the upper end of the valve stem (71) when the third part (723) is inserted into the water distribution pipeline (300).

12. The double-layer spray system of a cleaning machine according to claim 6, characterized in that: The top wall of the lower spray arm (100) extends upward along the edge of the water diversion port (102) to form a water diversion area (103) with an inverted U-shaped cross section; the lower end of the water diversion pipe (300) is connected to the top of the water diversion area (103); the lower end of the valve stem (71) is formed to constrain a water sealing member (711) in the water diversion area (103) so as to be movable up and down; the water sealing member (711) moves upward with the valve stem (71) to close the lower end of the water diversion pipe (300) and moves downward to open the lower end of the water diversion pipe (300); and an elastic member (73) is provided in the lower spray arm (100) which is elastically compressed under the water sealing member (711) and enables the water sealing member (711) to maintain an upward movement trend.

13. A cleaning machine, comprising a water tank (1), wherein a concave water return area (12) is provided at the bottom of the water tank (1), characterized in that: It also comprises a double-layer spray system as claimed in any one of claims 1 to 12, wherein the bottom of the lower basket (10) is supported on the bottom of the washing chamber (11), the upper basket (20) is located at the upper part of the washing chamber (11), and the lower spray arm is connected to the return water area (12) via a water pump mechanism (3).

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